H 2-38

CONFIRMED MILKY WAY

Constellation
Sagittarius

Equatorial coordinates
α = 18 06 01.143
δ = -28 17 04.319

Galactic coordinates
l = 2.8170°
b = -3.5412°

Suspected	1973^Ref
Confirmed	1984^Ref
Symbiotic IR type	D^Ref
Hot component type	shell-burning^Ref
Outbursts	-

Identifiers

H 2-38	IRAS 18028-2817	GSC2.4.2 S9TK004037	AAVSO 000-BJT-871
SIMBAD Haro 3-38	Pan-STARRS 74052715048088817	SAO -	VSX 135229
GAIA DR3 4062823905678372608	SkyMapper -	WRAY 17-108	GCVS -
2MASS J18060115-2817042	HIP -	Hen 2-343	BD -
WISE J180601.13-281704.3	TYC -	ESO 456-51	HD -

Symbiotic Catalogs

Bidelman (1954)	-	Allen (1984)	H2-38 (Conf.)	Belzcyński et al. (2001)	H 2-38 (Conf.)
Gaposchkin (1957)	-	Kenyon (1986)	H2-38 (Conf.)	Akras et al. (2019)	H 2-38 (Conf.)
Boyarchuk (1969)	-	Vaidis (1988, 1991)	H-2-38 (Conf.)

Position

Right ascension (°)	271.5048^Ref	Parallax (mas)	0.225±0.095^Ref	Reddening E(B-V) (mag)	0.66±0.03^Ref ^{, Note}
Declination (°)	-28.2845^Ref	Distance (kpc)	7.2±-^Ref 5.45^Ref ^{, Note}, 3.40^Ref ^{, Note}
Galactic longitude (°)	2.8170^Ref	Proper motion in α (mas/yr)	-1.26±0.08^Ref
Galactic latitude (°)	-3.5412^Ref	Proper motion in δ (mas/yr)	-6.93±0.06^Ref

Observations

X-Ray	Yes^Ref, No^Ref	IR type	D^Ref	Radio	Yes^Ref
X-Ray type	-	J (mag)	8.27^Ref	Flickering	-
GALEX FUV (mag)	-	H (mag)	7.24^Ref	Outbursts	-
GALEX NUV (mag)	-	K (mag)	6.48^Ref	Outburst type	-
IUE	No^Ref	WISE W1 (mag)	5.55^Ref	Jets	-
FUSE	No^Ref	WISE W2 (mag)	4.83^Ref	Resolved nebula	-
U (mag)	-	WISE W3 (mag)	2.93^Ref	IPmax (eV)	114^Ref
B (mag)	-	WISE W4 (mag)	1.77^Ref	[O III] lines	Yes^Ref
V (mag)	14.16^Ref	IRAS 12μm (Jy)	3.39^Ref	He II lines	Yes^Ref
R (mag)	-	IRAS 25μm (Jy)	2.06^Ref	[Fe VII] lines	Yes^Ref
I (mag)	12.08^Ref	IRAS 60μm (Jy)	4.00^Ref	O VI lines	Yes^Ref
BP (mag)	13.52^Ref	IRAS 100μm (Jy)	70.70^Ref
G (mag)	12.95^Ref	AKARI S09 (Jy)	-
RP (mag)	11.79^Ref	AKARI S18 (Jy)	1.91^Ref

Orbit

Orbital period (days)	-	γ velocity (km/h)	-	Size of giant’s orbit (AU)	-
Eccentricity	-	RV of giant (km/h)	-	Separation (AU)	-
Inclination (°)	-	Inferior conj. of giant (JD)	-	Mass function	-
Eclipses	-			Mass ratio	-
Orbital ephemeris	-

Cool component

Spectral type	M8.5 III^Ref, M7-8 III^Ref	Mass (M_⊙)	-	Pulsation	Yes^Ref
Eff. temperature (K)	2992^Ref	Radius (R_⊙)	-	Type	Mira^Ref
IR type	D^Ref	Luminosity (L_⊙)	-	Pulsation period (days)	395±16^Ref
Metallicity [Fe/H]	-			Pulsation ephemeris	Max (RM) = 2449205 + 395±16 x E^Ref

Hot component

Type/Spectral type	WD^Ref	Mass (M_⊙)	-	Spin period (min)	-
Shell-burning/Accreting-only	shell-burning^Ref	Radius (R_⊙)	-	Accretion disk	-
Eff. temperature (K)	-	Luminosity (L_⊙)	20000^Ref
Lower limit (K)	114000^Ref
Upper limit (K)	-

Links

SIMBAD CDS Portal

Notes

References

Allen, D. A., 1980, MNRAS, 192, 521, 1980MNRAS.192..521A
Gromadzki, M., Mikołajewska, J., Whitelock, P. et al., 2009, AcA, 59, 2, 169, 2009AcA....59..169G
Medina Tanco, G. A., Steiner, J. E., 1995, AJ, 109, 1770, 1995AJ....109.1770M
Mikołajewska, J., Acker, A., Stenholm, B., 1997, A&A, 327, 191, 1997A&A...327..191M
Pereira, C. B., Landaberry, S. J. C., Junqueira, S., 1998, A&A, 333, 658, 1998A&A...333..658P
Sanduleak, N., Stephenson, C. B., 1973, ApJ, 185, 899, 1973ApJ...185..899S
Stenholm, B., Acker, A., 1987, A&AS, 68, 51, 1987A&AS...68...51S
Webster, B. L., Allen, D. A., 1975, MNRAS, 171, 171, 1975MNRAS.171..171W

Last updated: April 18, 2022